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/ * 2(x² - 1)
2(7x - 3) + x(x - 1) + 20(x² - 1) = (3x + 1)(x + 1)
14x - 6 + x² - x + 20x² - 20 = 3x² + 3x + x + 1
18x² + 9x - 27 = 0 / : 9
2x² + x - 3 = 0
Δ = 1 + 24 = 25 √Δ = 5